Two‐Dimensional Heterovalent Alloying Hybrid Double Perovskite Solid Solution for Elevating Ferroelastic Photoelectric Response
Abstract
Abstract Hybrid double perovskites (HDPs), as the main candidates for lead‐free materials, have attracted great attention in the construction of ferroelectrics, ferroelastics, and high‐efficiency photodetectors. However, the photoelectronic performance of HDPs, including bandgap and carrier transport efficiency, is still far behind compared to lead‐based analogues. Excavate effective strategies to bridge this gap has always been an ongoing challenge. Herein, for the first time, we present a family of intrinsic solid solution based on heterovalent metal ions of HDPs, (cyclohexylmethylammonium) 4 (Ag/Bi)X 8 (X = Cl, Br, I). Such solid solution effectively improves the structural stacking mode, and thereby not only inducing 4/ mmmF 2/ m type ferroelastic phase transition but also making a narrower optical bandgap (∼1.74 eV) of (cyclohexylmethylammonium) 4 (Ag/Bi)I 8 lower than that of HDP counterparts. Benefiting from the collaborative overlap of wide absorption range and promoting effect ferroelastic domains on carrier transport, (cyclohexylmethylammonium) 4 (Ag/Bi)I 8 exhibits a photocurrent switching ratio ( I on / I off ) greater than 100 and photoelectric response across the entire UV–vis range. In short, this work provides a new perspective for improving the physical performance of HDPs.
Article Details
Authors (13)
Qiang‐Qiang Jia
Institute For Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 People's Republic of China
Gele Teri
Qi‐Fang Zhou
Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 P.R. China
Jia‐Qi Luo
Institute For Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 People's Republic of China
Hao‐Fei Ni
Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 P. R. China
Pei‐Zhi Huang
Institute For Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 People's Republic of China
Pei‐Guo Liu
Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 P.R. China
Lei Pan
Department of Chemistry
Chang‐Feng Wang
Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 P. R. China
Zunqi Liu
Zhi‐Xu Zhang
Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 P. R. China
Yi Zhang
Da‐Wei Fu
Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua 321004 P. R. China